浅议不同类型页岩的干酪根对沥青质纳米孔的控制作用  

The controlling effect of kerogen type of shale on asphaltene nanopore and its exploration significance

作　　者：刘洪林[1,2,3] 张介辉 计玉冰 李晓波 LIU Honglin;ZHANG Jiehui;JI Yubing;LI Xiaobo(China Petroleum Exploration and Development Research Institute, Beijing 100083, China;PetroChina Unconventional Oil and Gas Key Laboratory, Beijing 100083, China;National Energy Shale Gas Research and Development (Experiment) Center, Hebei Langfang 065007, China;Zhejiang Oilfield,PetroChina, Hangzhou 211762,China)

机构地区：[1]中国石油勘探开发研究院,北京100083 [2]中国石油非常规油气重点实验室,北京100083 [3]国家能源页岩气研发(实验)中心,河北廊坊065007 [4]中国石油浙江油田公司,杭州211762

出　　处：《非常规油气》2022年第3期1-10,共10页Unconventional Oil & Gas

基　　金：中国石油天然气集团公司重大现场试验项目“深层页岩气有效开采关键技术攻关与试验”(2019F-31);中国石油科技开发项目“页岩气提高储量动用程度技术研究”(KT2021-11-02)。

摘　　要：页岩中广泛发育的沥青质纳米孔是商业化页岩气的主要储集空间,对沥青质纳米孔隙的评价也逐步成为页岩储层和地质选区评价的重要参数。该研究以四川盆地海相、鄂尔多斯盆地过渡相及陆相页岩为例,采用岩石学、地球化学、吸附和电镜等技术手段对比研究了不同类型页岩有机地球化学、页岩孔隙结构等储层特征,通过统计分析认为;1)不同的页岩孔隙类型和结构组成特征不同,主要受控于页岩干酪根类型和演化过程;2)不同类型页岩孔隙都具有较高的复杂度,微孔隙越发育复杂度越高;3)不同类型页岩孔隙演化路径存在较大差异,在不同成熟阶段孔隙组成成分不同,中高成熟度海相页岩储集能力主要来自有通过气泡变孔形成的沥青质气孔。以上认识对于认识评价不同类型的页岩,指导页岩气勘探层系优选评价具有重要勘探意义。Asphaltene nanopores widely developed in shale are the main reservoir space of commercial shale gas,and the evaluation of asphaltene nanopores has gradually become an important parameter for shale reservoir and geological selection evaluation.In this paper,taking the marine,transitional and continental shale of Sichuan Basin as an example,the reservoir characteristics of organic geochemistry and pore structure of different types of shale have been studied by means of petrology,geochemistry,adsorption and electron microscopy.Through statistical analysis,the pore structure characteristics of different types of kerogen shale are different.Through statistical analysis,it is considered that:1)different types of shale have different pore types and structural composition characteristics,which are mainly controlled by the type and evolution process of shale kerogen;2)Different types of brilliant pores have high complexity.The more developed the micropores,the higher the complexity;3)There are great differences in pore evolution paths of different types of shale.The pore composition is different in different maturity stages.The storage capacity of medium and high maturity marine shale mainly comes from asphaltene pores formed by bubble pore transformation.The above knowledge is of great significance for understanding and evaluating different types of shale and guiding the optimization and evaluation of shale gas exploration series.

关 键 词：海相 过渡相 陆相 页岩 沥青质纳米孔 干酪根 

分 类 号：P624[天文地球—地质矿产勘探]